eta/DSI was initially designed with unique features specifically for virtual proving ground simulations. These features are not found in competing general purpose pre- and post-processors. The development of these features and functions was necessary to satisfy the following DSI requirements:
1. Generation of complicated full vehicle/full system models and retention of complex non-linear material properties, contact definitions, etc.
2. Post-processing of potentially large amounts of analysis data (displacement, forces, acceleration, stress, and strain) derived from time domain solution of multiple events and the conversion from time domain results into frequency domain results (frequency, mode shape and PSD, etc.).
3. Post-processing of stress and strain results of multiple events and conducting the fatigue life prediction.
eta/DSI incorporates a complete, direct LS-DYNA version 970 interface. eta/DSI reads and writes all LS-DYNA 970 cards, eliminating the need for text editing of the input deck. It creates and retains all material nonlinear properties, contact definitions, and loading conditions.
eta/DSI's built in fatigue post processor automatically performs a fatigue life analysis prediction to identify the key damage events and stress amplitudes. This data is then used to calculate the percentage of fatigue life remaining at the completion of the durability cycle. eta/DSI displays these results in easily read, combined fatigue life contour plots.
eta/DSI performs full vehicle NVH studies on simulated proving ground surfaces. eta/DSI automatically converts time-domain analysis results into frequency-domain via FFT (Fast Fourier Transform). eta/DSI determines both low and mid range frequencies up to 250Hz for operating mode shapes, frequencies, structural and airborne noise, and frequency responses such as idle shake, rough road, power train, and wheel imbalance.